单片机接PS/2键盘的c51示例
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ps2key.c
/*============================================================
使用1602液晶显示和PS/2键盘的示例 明浩 2004/2
-------------------------------------------------
http://www.cdle.net http://bbs.cdle.net/
==============================================================
SMC1602A(16*2)模拟口线接线方式
连接线图:
---------------------------------------------------
|LCM-----51 | LCM-----51 | LCM------51 |
--------------------------------------------------|
|DB0-----P1.0 | DB4-----P1.4 | RW-------P2.0 |
|DB1-----P1.1 | DB5-----P1.5 | RS-------P2.1 |
|DB2-----P1.2 | DB6-----P1.6 | E--------P2.2 |
|DB3-----P1.3 | DB7-----P1.7 | VLCD接1K电阻到GND|
---------------------------------------------------
Keyboard接线
PS/2--------51
1 DATA------P3.4
3 GND
4 VCC
5 CLK-------P3.3 接在51的外部中断，触发方式为低电平
本程式源码只供学习参考，不得应用于商业用途，如有需要请联系作者。
[注:AT89x51使用12M或11.0592M晶振 实测使用11.0592M]
[Keil uV2 7.01编译运行通过 程式中没有做键盘数据的奇偶校验]
=============================================================*/
#include
#include "scancodes.h"
#define LCM_RW P2_0 //定义LCD引脚
#define LCM_RS P2_1
#define LCM_E P2_2
#define LCM_Data P1
#define Key_Data P3_4 //定义Keyboard引脚
#define Key_CLK P3_3
#define Busy 0x80 //用于检测LCM状态字中的Busy标识
void LCMInit(void);
void DisplayOneChar(unsigned char X unsigned char Y unsigned char DData);
void DisplayListChar(unsigned char X unsigned char Y unsigned char code *DData);
void Delay5Ms(void);
void Delay400Ms(void);
void Decode(unsigned char ScanCode);
void WriteDataLCM(unsigned char WDLCM);
void WriteCommandLCM(unsigned char WCLCM BuysC);
unsigned char ReadDataLCM(void);
unsigned char ReadStatusLCM(void);
unsigned char code cdle_net[] = {"-www.cdle.net--"};
unsigned char code email[] = {"pnzwzw@cdle.net"};
unsigned char code Cls[] = {" "};
static unsigned char IntNum = 0; //中断次数计数
static unsigned char KeyV; //键值
static unsigned char DisNum = 0; //显示用指针
static unsigned char Key_UP=0 Shift = 0;//Key_UP是键松开标识，Shift是Shift键按下标识
static unsigned char BF = 0; //标识是否有字符被收到
void main(void)
{
unsigned char TempCyc;
Delay400Ms(); //启动等待，等LCM讲入工作状态
LCMInit(); //LCM初始化
Delay5Ms(); //延时片刻(可不要)
DisplayListChar(0 0 cdle_net);
DisplayListChar(0 1 email);
ReadDataLCM();//测试用句无意义
for (TempCyc=0; TempCyc<10; TempCyc++)
Delay400Ms(); //延时
DisplayListChar(0 1 Cls);
IT1 = 0; //设外部中断1为低电平触发
EA = 1;
EX1 = 1; //开中断
do
{
if (BF)
Decode(KeyV);
else
EA = 1; //开中断
}
while(1);
}
//写数据
void WriteDataLCM(unsigned char WDLCM)
{
ReadStatusLCM(); //检测忙
LCM_Data = WDLCM;
LCM_RS = 1;
LCM_RW = 0;
LCM_E = 0; //若晶振速度太高能在这后加小的延时
LCM_E = 0; //延时
LCM_E = 1;
}
//写指令
void WriteCommandLCM(unsigned char WCLCM BuysC) //BuysC为0时忽略忙检测
{
if (BuysC) ReadStatusLCM(); //根据需要检测忙
LCM_Data = WCLCM;
LCM_RS = 0;
LCM_RW = 0;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
}
//读数据
unsigned char ReadDataLCM(void)
{
LCM_RS = 1;
LCM_RW = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
return(LCM_Data);
}
//读状态
unsigned char ReadStatusLCM(void)
{
LCM_Data = 0xFF;
LCM_RS = 0;
LCM_RW = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
while (LCM_Data & Busy); //检测忙信号
return(LCM_Data);
}
void LCMInit(void) //LCM初始化
{
LCM_Data = 0;
WriteCommandLCM(0x38 0 //三次显示模式设置，不检测忙信号
Delay5Ms();
WriteCommandLCM(0x38 0 0 style="LINE-HEIGHT: 150%">WriteCommandLCM(0x38 1 //显示模式设置 开始需求每次检测忙信号
WriteCommandLCM(0x08 1 //关闭显示
WriteCommandLCM(0x01 1 //显示清屏
WriteCommandLCM(0x06 1 // 显示光标移动设置
WriteCommandLCM(0x0F 1 // 显示开及光标设置
}
//按指定位置显示一个字符
void DisplayOneChar(unsigned char X unsigned char Y unsigned char DData)
{
Y &= 0x1;
X &= 0xF; //限制X不能大于15，Y不能大于1
if (Y) X |= 0x40; //当要显示第二行时地址码+0x40;
X |= 0x80; //算出指令码
WriteCommandLCM(X 1 //发命令字
WriteDataLCM(DData); //发数据
}
//按指定位置显示一串字符
void DisplayListChar(unsigned char X unsigned char Y unsigned char code *DData)
{
unsigned char ListLength;
ListLength = 0;
Y &= 0x1;
X &= 0xF; //限制X不能大于15，Y不能大于1
while (DData[ListLength]>0x19) //若到达字串尾则退出
{
if (X <= 0xF) //X坐标应小于0xF
{
DisplayOneChar(X Y DData[ListLength]); //显示单个字符
ListLength++;
X++;
}
}
}
//5ms延时
void Delay5Ms(void)
{
unsigned int TempCyc = 5552;
while(TempCyc--);
}
//400ms延时
void Delay400Ms(void)
{
unsigned char TempCycA = 5;
unsigned int TempCycB;
while(TempCycA--)
{
TempCycB=7269;
while(TempCycB--);
};
}
void Keyboard_out(void) interrupt 2
{
if ((IntNum > 0) && (IntNum < 9))
{
KeyV = KeyV >> 1; //因键盘数据是低>>高，结合上一句所以右移一位
if (Key_Data) KeyV = KeyV | 0x80; //当键盘数据线为1时为1到最高位
}
IntNum++;
while (!Key_CLK); //等待PS/2CLK拉高
if (IntNum > 10)
{
IntNum = 0; //当中断11次后表示一帧数据收完，清变量准备下一次接收
BF = 1; //标识有字符输入完了
EA = 0; //关中断等显示完后再开中断 (注：如这里不用BF和关中断直接调Decode()则所Decode中所调用的所有函数要声明为再入函数)
}
}
void Decode(unsigned char ScanCode) //注意:如SHIFT+G为12H 34H F0H 34H F0H 12H，也就是说shift的通码+G的通码+shift的断码+G的断码
{
unsigned char TempCyc;
if (!Key_UP) //当键盘松开时
{
switch (ScanCode)
{
case 0xF0 : // 当收到0xF0，Key_UP置1表示断码开始
Key_UP = 1;
break;
case 0x12 : // 左 SHIFT
Shift = 1;
break;
case 0x59 : // 右 SHIFT
Shift = 1;
break;
default:
if (DisNum > 15)
{
DisplayListChar(0 1 Cls);//清LCD第二行
DisNum = 0;
}
if(!Shift) //如果SHIFT没按下
{
for (TempCyc = 0;(UnShifted[TempCyc][0]!=ScanCode)&&(TempCyc<59); TempCyc++); //查表显示
if (UnShifted[TempCyc][0] == ScanCode) DisplayOneChar(DisNum 1 UnShifted[TempCyc][1]);
DisNum++;
}
else //按下SHIFT
{
for(TempCyc = 0; (Shifted[TempCyc][0]!=ScanCode)&&(TempCyc<59); TempCyc++); //查表显示
if (Shifted[TempCyc][0] == ScanCode) DisplayOneChar(DisNum 1 Shifted[TempCyc][1]);
DisNum++;
}
break;
}
}
else
{
Key_UP = 0;
switch (ScanCode) //当键松开时不处理判码，如G 34H F0H 34H 那么第二个34H不会被处理
{
case 0x12 : // 左 SHIFT
Shift = 0;
break;
case 0x59 : // 右 SHIFT
Shift = 0;
break;
}
}
BF = 0; //标识字符处理完了
}
scancodes.h
unsigned char code UnShifted[59][2] = {
0x1C 'a'
0x32 'b'
0x21 'c'
0x23 'd'
0x24 'e'
0x2B 'f'
0x34 'g'
0x33 'h'
0x43 'i'
0x3B 'j'
0x42 'k'
0x4B 'l'
0x3A 'm'
0x31 'n'
0x44 'o'
0x4D 'p'
0x15 'q'
0x2D 'r'
0x1B 's'
0x2C 't'
0x3C 'u'
0x2A 'v'
0x1D 'w'
0x22 'x'
0x35 'y'
0x1A 'z'
0x45 '0'
0x16 '1'
0x1E '2'
0x26 '3'
0x25 '4'
0x2E '5'
0x36 '6'
0x3D '7'
0x3E '8'
0x46 '9'
0x0E '`'
0x4E '-'
0x55 '='
0x5D '\'
0x29 ' '
0x54 '['
0x5B ']'
0x4C ';'
0x52 '''
0x41 ' '
0x49 '.'
0x4A '/'
0x71 '.'
0x70 '0'
0x69 '1'
0x72 '2'
0x7A '3'
0x6B '4'
0x73 '5'
0x74 '6'
0x6C '7'
0x75 '8'
0x7D '9'
};
unsigned char code Shifted[59][2] = {
0x1C 'A'
0x32 'B'
0x21 'C'
0x23 'D'
0x24 'E'
0x2B 'F'
0x34 'G'
0x33 'H'
0x43 'I'
0x3B 'J'
0x42 'K'
0x4B 'L'
0x3A 'M'
0x31 'N'
0x44 'O'
0x4D 'P'
0x15 'Q'
0x2D 'R'
0x1B 'S'
0x2C 'T'
0x3C 'U'
0x2A 'V'
0x1D 'W'
0x22 'X'
0x35 'Y'
0x1A 'Z'
0x45 '0'
0x16 '1'
0x1E '2'
0x26 '3'
0x25 '4'
0x2E '5'
0x36 '6'
0x3D '7'
0x3E '8'
0x46 '9'
0x0E '~'
0x4E '_'
0x55 '+'
0x5D '|'
0x29 ' '
0x54 '{'
0x5B '}'
0x4C ':'
0x52 '"'
0x41 '<'
0x49 '>'
0x4A '?'
0x71 '.'
0x70 '0'
0x69 '1'
0x72 '2'
0x7A '3'
0x6B '4'
0x73 '5'
0x74 '6'
0x6C '7'
0x75 '8'
0x7D '9'
};
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